Serial dilutions are generally made: Group of answer choices When the appropriate viable count is unknown To reduce the number of colonies to count on agar plates To reach a suitable dilution while minimizing error All of the other answer choices are correct Based on 10-fold dilutions, although other serial dilution factors are possible e.g. 100-fold
Question
Serial dilutions are generally made: Group of answer choices
When the appropriate viable count is unknown
To reduce the number of colonies to count on agar plates
To reach a suitable dilution while minimizing error
All of the other answer choices are correct
Based on 10-fold dilutions, although other serial dilution factors are possible e.g. 100-fold
Solution
The correct answer is "All of the other answer choices are correct".
Serial dilutions are indeed made when the appropriate viable count is unknown. This is because the initial concentration of a sample may be too high to count individual colonies, so diluting it can help get a more accurate count.
They are also made to reduce the number of colonies to count on agar plates. If there are too many colonies, they can merge together and become difficult to distinguish and count.
Serial dilutions are also used to reach a suitable dilution while minimizing error. By diluting a sample in a series of steps, rather than all at once, you can reduce the chance of making a large error in the final dilution.
Finally, while 10-fold dilutions are common, other dilution factors can also be used, such as 100-fold, depending on the needs of the experiment.
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